Podcasts come in all shapes and sizes, and are everywhere. For example, should you wish to listen, there's Grammar Girl, for the youthful prescriptivists amongst us, Podcasting in Education (podcasts about podcasting), Radio WillowWeb (podcasts by and for kids), and Just Vocabulary, a podcast that teaches just two words per show. Most have RSS feeds so that you can stay current.
Perhaps the easiest place to begin making your own podcasts is http://www.podomatic.com/. Or you might try SplashScreen.net.
A tutorial by a teacher-trainer.
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